This article was posted 05/17/2006 and is most likely outdated.

Top 101 NEC Rules – Part 1 of 4
 

 
Subject - Top 101 NEC Rules – Part 1 of 4

May 17, 2006  

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Top 101 NEC Rules – Part 1 of 4

 

imageThis PDF is a free resource from Mike Holt Enterprises, Inc. It is always our pleasure to give back to the industry as much as we can, whenever we can. For this reason we’ve created this free “Top 101 Rules” from Mike's Understanding the NEC, Volume 1, 2005 Edition textbook. These are the top 101 rules that Mike and his team feel are the most important for every electrician to know.

 

It’s a quick reference and guide to make sure you’re up to speed on these very important rules.

 

We’ve divided this file into 4 parts for easy downloading. We’ll be sending one part out each month over the next 4 months. This month is Part 1 (Rule 1-25). An outline of the 25 rules is listed below.

 

Click on the following link below to start your download.

 

Download: Top 101 Rules – Part 1 (8.59 MB)

If you encounter any problems, be sure you have the latest version of Adobe Acrobat installed. You may click here to install the latest version now. Be advised that this download may take a few minutes.

 

Rule 1—90.1 Purpose of the NEC

Rule 2—90.2 Scope of the NEC

Rule 3—90.3 Code Arrangement

Rule 4—90.4 Enforcement

Rule 5—90.5 Mandatory Requirements and Explanatory Material.

Rule 6—90.7 Examination of Equipment for Product Safety

Rule 7—110.2 Approval of Equipment

Rule 8—110.3 Examination, Identification, Installation, and Use of Equipment

Rule 9—110.14 Conductor Termination

Rule 10—110.16 Flash Protection Warning

Rule 11—110.26 Spaces About Electrical Equipment

Rule 12—200.6 Identification of the Grounded Neutral Conductor

Rule 13—200.7 Use of White or Gray Color

Rule 14—210.3 Branch-Circuit Rating

Rule 15—210.4 Multiwire Branch Circuits

Rule 16—210.5 Identification for Branch Circuits

Rule 17—210.8 GFCI-Protected Receptacles

Rule 18—210.12 Arc-Fault Circuit-Interrupter (AFCI) Protection

Rule 19—210.19 Conductor Sizing

Rule 20—210.20 Overcurrent Protection

Rule 21—210.21 Outlet Device Rating

Rule 22—210.52 Dwelling Unit Receptacle Outlet Requirements

Rule 23—225.18 Clearances

Rule 24—225.30. Number of Supplies

Rule 25—225.31 Disconnecting Means
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Comments

  • Mike,

    Before you publish part 2, the 2 most common Code violations that I see in new services in the greater Cleveland, Ohio area are 230.54(C) and 230.54(F). A lot of electricians and linemen around here are still placing overhead service splices above the weatherhead even though that was outlawed about 30 years ago because stranded conductor acts as a poor excuse for a water hose. Compact stranded conductor is an even poorer excuse for a water hose.

    There is even a place down my street where a 120Y208 volt weatherhead is above the point of attachment and Cleveland Electric Illuminating Comapny's linemen somehow placed the splices ABOVE the weatherhead!

    The exception to 230.54(C) needs to be tightened up. There is ALWAYS a way for a weatherhead on a building to be above the point of attachment and First Energy regulations require a minimum of 12 inches above the point of attachment. NEC 230.24(A) exception no. 4 allows a weatherhead to be above the edge of a flat roof.

    The ONLY time that a weatherhead MUST be mounted below the power source is when the weatherhead is mounted on a utility-owned pole and the service conductors connect directly to a transformer secondary or the utility requires the weatherhead to be below secondary conductors that are mounted on their pole. In both cases the service conductors should contain a strand blocking compound, be spliced to pigtails that contain a strand blocking compound, or the conductors be connected to a transformer with crimped or welded connectors that have a skirt that prevents water from entering the wire strands. An example of a strand blocking compound is Pirelli Strandseal which prevents water and gas flow between wire strands.

    One of the ways that water can enter a splice is through the bare neutral in triplex and quadples service drop cables. There is a common crimp splices that has a groove running from one end to the other and this allows water to sneak underneath electrical tape. This groove cannot be reliably packed with silicone sealant to stop water flow. Also, snap on insulating cover kits can either allow a splice to drain or allow water in.

    Mike Cole mc5w at earthlink dot net

    We have a lot of electricians and electrical inspectors around here who are somehow 30 years behind NEC.

    Michael R. Cole
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